Subscription QoS can't be changed

[loremus]

While setting up a system with persistent connection, I noticed that there seems to be no option to configure the QoS for client subscriptions. With the cleanSession: false option in the MqttOptions, and after publishing a message from another client with a QoS greater than zero, the messages sent while the Vue client was disconnected were not delivered upon reconnection.

My suspicion is that the subscription QoS might default to zero, which would explain why the messages were not delivered.

Could you please confirm if this is the case? If so, is there a way to specify the QoS for subscriptions in the current implementation?